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//Code to save the image when arrive to server
// Take what you receive in UTF8 from the POST and...
$new_image = chunk_split(base64_encode($my_image));
$query = "INSERT INTO my_table (Image) VALUES ('$my_image')";
mysql_query($query);
//Remember to define LONGBLOB (or what you need) the column my_table

//Code to retrieve image from the server
//Query the MySQL to retrieve what you saved before and send as answer under JSON if is an array or in normal if 1 data
$ANSWER = json_encode($my_datas);
$ANSWER = $my_datas;
//Here is your choice to choose to echo or use the AGK... hmmm i don't know, but i think you already done some test with normal text

//Creating the image from data
//Imagine you get XML or JSON UTF8 data from the request (REQUEST_RESULT)
//If you don't need JSON or XML you can manage the data as they arrive

NSData *_temp_image = [NSData dataWithBase64EncodedString:[NSString stringWithUTF8String: getStringFromWChar(JSON::decode(REQUEST_RESULT)]];

//You need a JSON parser (as i done my own one, cause the Apple one is not very good)

UIImage *_im = [UIImage imageWithData:_temp_image];

BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:[imageUrl path]];
    if(fileExists){
        NSData *image = [NSData dataWithContentsOfURL:saved_image.url];
    }